「Pinworm is an intestinal infection caused by tiny parasitic worms. One of the most common roundworm infections, pinworm infections affect millions of people each year, particularly school-age [children]. If your child develops a pinworm infection, try not to worry. Pinworms don't cause any harm (just itching), and it won't take long to get rid of them. And people who have pinworms aren't dirty—[children] can get pinworms no matter how often they take a bath. Pinworm infections (also known as 'seatworm infection,' 'threadworm infection,' 'enterobiasis,' or 'oxyuriasis') are contagious. Pinworms get into the body when people ingest the microscopic pinworm eggs. These eggs can be found on contaminated hands and surfaces…. The eggs pass into the digestive system and hatch in the small intestine. From the small intestine, pinworm larvae continue their journey to the large intestine, where they live as parasites (with their heads attached to the inside wall of the bowel). About 1 to 2 months later, adult female pinworms travel from the large intestine to the area around the rectum. There, they will lay new pinworm eggs, which trigger itching around the anus. When someone scratches the itchy area, microscopic pinworm eggs transfer to their fingers. Contaminated fingers can then carry pinworm eggs to the mouth, where they are go back into the body, or stay on various surfaces, where they can live for 2 to 3 weeks. …Often, someone can have a pinworm infection without knowing it. When symptoms are present, the most common one is itching around the rectum and restless sleep. The itching is usually worse at night because the worms move to the area around the rectum to lay their eggs. In girls, pinworm infection can spread to the vagina and cause a vaginal discharge. If the itching leads to broken skin, it can also lead to a bacterial skin infection. If your child has a pinworm infection, you can see worms in the anal region, especially if you look about 2 or 3 hours after your child has fallen asleep. You also might see the worms in the toilet after your child goes to the bathroom. They look like tiny pieces of white thread and are really small—about as long as a staple. You might also see them on your child's underwear in the morning. Abdominal pain and nausea are less common symptoms but can happen if there are many pinworms in the intestines.」
[ https://www.kidshealth.org/en/parents/pinworm.html 2014-11-16 ]
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